(Shade loving hosta, lady fern, and solomon's seal. They were tiny 4 inch transplants a few weeks ago but each have already tripled in size)
(Variegated Hosta growing under a Shoshoni Viburnum)
(Thick Chamomile foliage that grows in full sun on the left, Shasta Daisy foliage in the center)
Chamomile, which is considered a weed in some parts of the world, is another plant that isn't typically thought of as a filler. In my garden however, I love how their delicate, lace-like leaves spread all over and fill in gaps. I grow both varieties - Roman (a perennial) and German (a self-seeding annual). Both varieties spread wherever they want and give pretty little blossoms all summer long. Some gardeners keep them under control in containers. Their tiny seeds spread like fire in late summer and they can be considered invasive, but I actually like the way they take over open spaces. They love full sun, where their foliage gets full and thick. They'll grow in shade and will still flower, however the foliage won't be as full. In the cooler spring months here in Seattle, they start of tall, thin and leggy. But come July and August, these little plants will bulk up in volume.
(Leggy Chamomile in bloom)
My favorite plant to cover lower ground areas is Irish Moss. I just love the varying tones of green and how it fills in around stones, pavers and bricks. I wish it grew faster, in my garden this is a slower growing plant and has taken several seasons to fill in just small areas. Come summer though, I love the tiny white blossoms that shoot out of the compact green foliage and appreciate how much it's grown over the years.
What are some of your favorite plants to use as gap fillers in your garden? I'd love to hear of any success/ failure stories you may have.